// Copyright 2022 PingCAP, Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#pragma once

// todo move this util into other dir
#include <Core/Types.h>
#include <Storages/Page/PageUtil.h>

namespace DB::MVCC
{
// MVCC config
struct VersionSetConfig
{
    size_t compact_hint_delta_deletions = 5000;
    size_t compact_hint_delta_entries = 200 * 1000;

    void setSnapshotCleanupProb(UInt32 prob)
    {
        // Range from [0, 1000)
        prob = std::max(1U, prob);
        prob = std::min(1000U, prob);

        prob_cleanup_invalid_snapshot = prob;
    }

    bool doCleanup() const { return PageUtil::randInt(0, 1000) < prob_cleanup_invalid_snapshot; }

private:
    // Probability to cleanup invalid snapshots. 10 out of 1000 by default.
    size_t prob_cleanup_invalid_snapshot = 10;
};
} // namespace DB::MVCC